By pure accident, I find a way to check your DC for leaks. It's pretty simple.
Step one: Cut some Padauk on the table saw.
Step two: look for the telltale orange dust!
(Not that this produces any noticeable decline in performance that I am aware of)
The 1974 Craftsman electric chainsaw, that I'm still using today, came with a built in sharpener. It worked, but ate up the chain really quickly. After the chain that came in it wore out, I took all that stuff out, and never used anything but a regular chain on it again. Today, it gets used with a dry chain, cutting out bad parts of old houses, since I don't want to throw oil inside the houses.
You need to be able to sharpen a chain regardless of what type of saw you use. Ask Spanky for backup on this. I just use a file.